China DOS Union

Make a batch script to test whether the connection to a certain IP address is normal. Below is what I wrote, very crude haha.

ping 17.0.11.1 > a.txt
type a.txt | find "ms" && echo ----Connection is normal----

Is there a way to determine connectivity without generating a .txt file?
Thanks

Too late, everyone is asleep?
Hehe

ping 17.0.11.1
pause

Originally posted by lxmxn at 2007-3-9 05:22:

ping 127.0.0.1|find "ms" >nul&&echo OK

Why is it written so complicated?

ping -n 1 127.1>nul 2>nul &&(echo ok)

Still not quite clear!

Often see this thing, also checked on the net. Also checked in the XP built-in help. Still didn't understand. Which boss can give an explanation? Thanks

It seems that ping -n 1 127.1>nul&&echo ok is okay. What about 2>nul? Let me explain.

In the command line, 2>nul is used to redirect the standard error output (stderr) to the null device, which means to suppress the error messages. For example, if there is an error message that would normally be displayed, using 2>nul will make it not show up.

Search by yourself, search in the forum

Originally posted by marryli at 2007-3-7 22:14:
Make a batch script
Test if the connection to a certain IP address is normal
The following is what I wrote, very simple ha

ping 17.0.11.1 > a.txt
type a.txt | find "ms" && echo ----Connection normal----



There is ...

set count=10
:again
set b=false
ping 17.0.11.1|find "ms"&&set b=ok&&echo ----Connection normal------&&exit
if %b%==false echo -----Can't connect------
set count=count-1 ::Feels a bit wrong,....
if count==0 exit
goto again

>It's redirection. The output of the command is displayed in cmd by default. Using > won't display it.
>nul releases the output

Originally posted by hxmupdata at 2007-3-10 22:07:
set count=10
:again
set b=false
ping 17.0.11.1|find "ms"&&set b=ok&&echo ----连接正常------&&exit
if %b%==false echo -----连接不到------
set count=count-1 ::感觉这有点不对,....
if count==0 exit
goto again

To perform arithmetic operations with set, you should add the "/a" parameter. It should be "set /a count=count-1"

[ Last edited by lxmxn on 2007-3-15 at 11:29 AM ]

Originally posted by lxmxn at 2007-3-11 11:43:

You should add the parameter "/a" when using set for arithmetic operations, "set /a count==count-1"

Oh, I see. I'm just learning. I usually program in other languages...

Ask a question: If you don't add "/a count=count-1", what will the value of count be? Why...
I don't know if my own understanding is correct